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DTC Detection Logic

WARNING: This page is about a different car, the 2011 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.
DTC DETECTION LOGIC

DTC No. Trouble diagnosis name (Trouble diagnosis content) DTC detecting condition Possible cause
P0117 ECT SEN/CIRC (Engine coolant temperature sensor circuit low input) An excessively low voltage from the sensor is sent to ECM.
  • Harness or connectors (The engine coolant temperature sensor circuit is open or shorted.)
  • Engine coolant temperature sensor
P0118 ECT SEN/CIRC (Engine coolant temperature sensor circuit high input) An excessively high voltage from the sensor is sent to ECM.
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